Issue on docs: custom_nodes still using V2 code

Path: /custom-nodes/backend/server_overview

I'm new here, so it took me a while to realize that `example_node.py` was in fact up-to-date and it was the online docs that were using a completely different schema (V2 from what I can tell)

Would be neat if it were updated; it would save thousands of "man hours" digging through current code to infer how things are supposed to work really quick. (Not in a fundamental way, but there's always the chance of sight-reading something wrong or missing a piece of the puzzle, so I'm always uneasy without at least confirmation that, _yes, this thing is designed for that; no, that thing doesn't work this way_, etc

Start at /custom-nodes/backend/server_overview and compare its custom-node schema with the up-to-date example_node.py mentioned in the issue. Update the page so it accurately reflects the current schema and clearly confirms which behaviors are supported; verify the rendered documentation matches the example.

Written by the indexing model from the issue text.